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E46 (1999 - 2006) The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

The BMW addiction has hit me. I currently own 3 and bought my daughter a 2001 325i that had ran hot. When I pulled the head off found the #4 piston is burnt and cylinder wall is scored. I am looking at pulling this motor and replacing it. I have been told that a 01 or 02 2.5 motor is plug and play assembly and that a 03-06 I would have to change some items. I could not find an interchange list online and was wondering what year besides the 01 would be an option. Thanks in advance and look forward to learning a lot from this site.